San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
How Far And High Can A Rat Jump?
Jumping is a major part of many animals' survival instincts including rats. But in the case of these small rodents, they have a special way of using this particular survival instinct to their best advantage. One of the most common rats around, which is the brown rat, is known to be able to jump over four feet horizontally or in a downward slope and leap vertically to about 77 centimeters without hurting itself. This clearly shows how high rats can jump and how well they can suspend themselves in the air.
The jumping performance of rats depends mainly on their species because some rats are big while others have lighter bodies which tend to support agile movements. For instance, black rats with lean bodies are known to be able to leap over five feet. While brown rats with large body frames find it quite difficult to leap but do well at jumping downwards.
Another reason why some rats jump better than others is mainly because of their better survival instincts and hunting abilities. Rats in the wild are better at jumping than those in the suburban and urban areas. Therefore, you shouldn't expect the rats in your home to jump or leap that high.
Rats are naturally silent animals and will prefer to move around unnoticed. But in some cases, they make use of their jumping skills. One of the special cases in which they use their jumping skills is when they see a possible threat or a predator. They often use this to propel their speed and get away as soon as they can. Their speed and swift body movements are one of the ways they can stay alive and avoid been eaten by a predator.
